Paper-bag machine.



No. 840,073. v PATENTED JAN. 1, 1907.

. W. A. LORENZ,

PAPER BAG MACHINE.

APPLICATION I'ILED AUG. 23, 1900.

6 SHEETSSHEET A 3 R. N A Wt tnea .ses [711/ 9111507:

PATENTED JAN. 1, 1907.

w@ A. LORENZ.

' PAPER BAG MACHINE.

APPLICATION FILED AUG. 23, 1900.

6 SHEETS-SHEET 2.

Inventor" PATENTED JAN. 1, 1907.

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- l'nve niar WW "6% W. A. LORENZ.

PAPER BAGMAGHINE.

APPLIOATION FILED we. 23, 1900.

WZ'zneJJes JIM 0/14 6% PATENTED JAN. 1, 1907.

W. A. LORENZ.

PAPER BAG MACHINE.

APPLICATION FILED AUG. 23, 1900.

6 SHEETS-SHEET 4.

u xxx- 22E. RE. 8w N Inventor.-

No. 840,073. PATENTED JAN. 1, 1907.

W. A. LORENZ.

PAPER BAG MACHINE. APPLICATION FILED AUG.23,-1900.

0 spams-31mm a. FLg.

Wit mess es 'Inl/antor:

PATENTED JAN. 1, 1907.

W. A. LORENZ. PAPER BAG MACHINE. APPLICATION FILED we. as. 1900.

6 SHEETS-SHEET 6.

v Inventor.-

Wznesses UNITED STATES PATENT OFFICE.

WILLIAM A. LORENZ, OF HARTFORD, CONNECTICUT, ASSIGNOR TO UNION PAPER BAG MACHINE COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

- Specification of Letters Patent.

Patented J an. 1, 1907.

Application filed August 28,1900. Serial No. 27,864-

Teal] whom, it Tmty concern:

chines, of which the following is afull, clear,

and exact specification.

- This invention relates to paper-bag machines, and particularly to' that class thereof wherein square-bottomed bags are formed from tucked or bellows-sided tubing.

The invention comprises what is technically known as the diamondfolding sec-.

tion of a paper-bag machine, receiving the bellows-sided blanks from any suitable blank-forming mechanism, folding the wellknown diamond folds therein, and passing the diamond-folded blank on to any referred mechanism for completing the bag by pasting and cross-folding the end flaps of the diamond.

The general object of the presentinvention isto provide improved devices having an improved mode of operation upon the blank whereby the unfolding of the bellows side tucks and their refolding into the triangular and diamond folds is accomplished in a more natural, certain, rapid, and accurate manner than heretofore.

An important feature of this invention is that whereby the blanks are carried in a rotary path while the blank-folding mechanism is carried back and forth in an oscillatory path, having its approximate center of oscillation situated within the rotary path of the blank-support, whereby the blank-folding' mechanism may be carried in coactive relation to the blank and its folding-bed throughout a very considerable angle of their respective rotary and oscillatory movements, thereby giving more time for the blank-folding operation and also permitting the blank' folding mechanism to return in the most di-- rect line and with the least amount of necessary movement to its coactive relation to the succeeding blank. Means extraneous to the blank-support are provided for operating the parts of the blank-folding mechanism as it is carried forward and back. Thus the blanksupport travels forward continuously with the successive blanks, while the blank-folding mechanism, mounted and dr ven in practical independence of the blank-support, oscillates forward and back in close and extended coactive relation to the succeeding blanks. folding mechanism may be employed to great advantage in connection with a mulple blank-support or folding-bed carrying a plurality of blanks.

' Another feature of the invention consists in mounting the blank-folding means for rising-and-falling movemcntaway from and toward the surface of the blank-support, thus facilitating the engagement ofthe foldingmeans with the blank prior to the folding operations. This capacity for rising-andfalling movement is also utilized'in connection with the folding operation itself, the folding means beingcarried away from the surface of the blank-support as it is being turned backwardly, so as to open the tucked sides of the tube far enough to develop the outer margins of the inner triangular folds at an early stage in the turning movement of'the folding means. These triangular. folds are formed from portions of the tucked side plies, which by the act of their conversion into the triangular folds are unfolded from their tucked-in position and refolded on new lines. This unfolding of these portions'of the tucked sides .and the refolding into the triangular folds constitute an important and critical step in the procedure of manufacturing this kind of paperbag with the rapidity and accuracy required for commercial success. The present machine contains two factors which contributein an important degree to the success of this critical step: First, the front end of the blank is held in an elevated, position above the surface of the foldingebed, and, secondly, the triangular folds are defined at an early stage of the turning-back movement inthe front end of the upper ply. These i two factors cooperate to avoid wide angular In'this Way a single set of blank (See Figures 5 and 6'.)

distention of the front ends of the top and bottom lies during the time that the triangular olds are being defined, thus relieving the side folds from undue strain while they are being converted into those triangular folds.

Further features bf the present invention reside in the construction and arrangement of the diamond-folding mechanism, whereby Lil ' which power may be applied from any confolding means is mounted for oscillation upon Fig. 1. Fig. 4 is a section on line 4 4, Fig. 1.

Fig. 5 is a partial view corresponding to Fig. 3, showing the partsm the position where the mner'triangular folds have been El-PPIOXP mately outlined. Fig. 6 is a front view of the same, Fig. 7 is a view corresponding to Fig. 5, showing the carrier and blank-folding mechanism at the end of the working stroke of the latter with the diamond flattened down. Fig. 8 is a front view of the same, and Fig. 9 is a side view of the machine, incorporating a modification of the blank-support.

In the drawings, 10 designates the bedplate, to which are secured two upright side frames in which the several cooperating shafts for,driving the various devices are supported. Suitable means are provided forfeeding blanks or bellows-sided tubing into the machine, such means consisting in the present instance of suitable feed-rollers 13 and 14, mounted on shafts 15 and 16, respectively, the latter being journaled in boxes 17, movably held in the side frames and acted upon by suitable springs 17 (See Fig. 2.) The feed-rollers are geared together by means of gears 18 and 19, mounted on said shafts between the side frames 1 1 and 12, and said feed-rollers are driven by a gear 20, mounted on the lower roll-shaft and obtaining motionfrom a similar gear21, mounted upon a shaft 22, which constitutes the main driving-shaft of the machine .and to venient source. From the feed-rollersthe blank or tube is conducted to a suitable blank-support, serving as 'a folding-bed and as a means for carrying the blank forward during the'bottom or diamond forming operation. the blank-support is a blank-folding means ada )ted to engage the 11 per ply of the tube or blank andturn it bac r, the blank-support and blank-foldingmeans coacting to open out the end of the blank and form the diamond. The blank-support is of the rotary type and consists, substantially, of a cylinder 23, mounted upon a shaft 24, which receives rotary movement through a gear 25, secured thereto and in engagement with a gear-26, mounted upon the main driving-shaft 22.

The tuck-holders 27 are journaled at 28 on opposite sides of the blank-support and serve to support those portions of the lower ply 01 the I Connected for cooperation with hold to the lower surface of the blankblank which are not to be folded back, the front angular edges serving to define the extent to which the said lower ply is folded back to form the'inner triangular folds. The lower ends 29 of these tuck-holders arepreferably provided with cam-rollers 30, which engage with stationary cams 31, the peripheries of which are shaped to open and close the tuck-holders at the proper times. The blank-support 23 is provided with-a, front in the web 23 of the blank-support and carries a roll 34, engaging with the cam under spring serving to open and close 'the said holder at suitable times. The blank-engaging portion of the front holder is adapted to engage with. the blank at a substantial distance above the surface of the bed, thus re lieving the front end of 'the blank from the strains which would result from holding the end of the lower ply of the blank down upon the surface of the blank-support during the formation of the innner triangular folds, and thereby facilitating the easy formation of those folds without losing control of the flap, Figs. 5 and 6.

The blank-folding mechanism is mounted for oscillation in a curved path the center of which is within the rotary path of the foldi n-g-bed, the folding means being mounted upon arms 48, which. are j ournaled upon the hubs 51. A blank-folding member or'plate 40, which directly engages with the blank and has a defining edge 39 for defining the socalled primary transverse cross-fold line .of the blank, is provided at its opposite sides with brackets having trunnions 41, which are journaled inthe carriers 52, the axes of the trunnions being substantially in alinement with the defining edge'39. The plate 40 is provided with means for engaging the side edges of the upper ply of the blank at the portions which are to form the upper and outer corners of the inner triangular folds of the blank. Those means consist of the box-holders 42, which are pivoted by means of the screws 43, upon the extensions shaped ends of the box-holders being carried, by means of the spring 46, into the side tucks of the blank below' the plate 40 as the parts move forward from the blank-receiving po-' sition shown in Fig. 3. The box-holders are opened to receive the blank by' means of the abutments 44, which are secured to a fixed shaft or bar and collide with the arms 42 of the, box-holders as the latter are carried back toward the position shown in Figs. 1 and 3. The outer end of the plate 40 slides in a guide or swivel 47, which is pivotally supported upon the side frames.

The oscillatory movements of the blankfolding mechanism are effected by id a a cam on the shaft 22, the 'cam serv ng o the pressure of a springv 36, the cam and diamond-holder 32-, which. is journaled at 33 v 41 of the trunnion-brackets, the outer -L-.

in coaction with the guide 47 imparting to' the folding-plate 40 an oscillatory movement uponits trunnions 41. The extent of these oscillatory movements of the arms 48 and of the plate 40 may be seen by comparison of Figs. 4 and 7. v

The carriers which support the trunnions 41 of the plate consist in the present instance of slides 52, which are mounted for sliding movement upon the arms 48 in a substantial radial direction with reference to the center of oscillation of those arms. The inner ends of the sliding carriers 52 engage withthe cam '54, preferably by means of rollers 53, whereby a rising-and-falling movement from and toward the surface of the blanksupport is imparted to the blank-folding means. This rising-and-falling movement of the blank-folding means performs two important functionsfirst, to facilitate the proper engagement of the folding instrumentalities with the blank when in position shown in Fig 3, the blank-folding means being then elevated a substantial distance above the surface of the blank-support, and, second, to enable thetucked sides of the blank to be separated a substantial distance at the time of forming or outlining the inner triangular folds, as represented in Figs. 5 and 6, thus enabling them to be formed at an early stage in the turning movement of the folding means, while the front ends of the plies, and especially the side plies, are free from strain. As shown in Figs. 5 and 6,these triangular folds are in this machine safely defined by the time the upper ply of the blank is turned to a position substantially perpendicular to the surface of the folding-bed, and hence before the front end of the blank is distended far enough to draw its side edges together. After those triangular folds are safely defined or outlined the aforesaid side edges are drawn toward each other by the lengthwise distention of the front end of the blank due to the continued backward turning movement of the folding-plate, during which time the earns 55 move the carriers inwardly, and thus carry the blank-folding plate toward the surface of the blank-support, therebyfacilitating the formation and flattening of the diamond, as shown in Figs. 7 and 8. Thus the path of movement of the blank-folding plate 40 is a composition or resultant of the three individual movements imparted to itnamely, its oscillatory movement upon its trunnions 41, its oscillatory movement with the arms 48 forward and back in the general direction of travel of the blank-sup ort, and its rising-arid-falling-movement wit the carrier-slides 52 away from and toward the cen ter of oscillation of the arms 48. The path of movement of the defining edge 39 of the plate which results from the arrangement described is represented in Figs. 5 and 7 by a curved otanddash line. That path may, however, be varied to any desired extent by suitably timing and proportioning the can! 50 and the cam 55. It is frequently desirable thus to vary the path of movement of the blank-folding plate, and particularly the path of movement of the defining edge thereof, in order to adapt the machine to the manipulation of different kinds of thicknesses of paper or to suit changes in the characteristics of the same paper due to changes in the humidi ty of the atmosphere. Means are herein provided for enabling these changeb to be quickly made. The earns 55 are provided with three different working faces, (herein designated as 54, 54, and 54",) either of which may be brought ir to working relation to the carrier-slides 52 merely by loosening or removing the screws 56 and then turning the cams 55, so as to bring thedesired cam-face into operative position, in which it is again held by the screws 56. This change is quickly made and enables the path of movement of the blank-folding member to be selectedly varied with relation to the path of travel of the blank. It will be understood that the paths of movement of the box-hold nected by a link 77 with the crank-aim 78 appurtenant to the drop-plate shaft 70. After the diamond has thus been flattened by the drop-plate the blank is carried beneath the presser-roll 79 on the shaft 60, after which the delivery-plate 80 deflects the blank from the blank-support and delivers it to other devices, which may include a pastorroll and flap-foldingdevices, as81 82, which transform the blank into the completed bag.

As a means for operating the box-holder's 42 to release the blank toward the conclusion of the diamond-folding operation arms 57 are em loyed, which are pivoted on the studs 58 and are moved into the pathway of the arms 42 of the box-holders by means of a cam 59 upon the shaft 50, which is driven from the carrier-shaft 24 by means of gears 61 and 62, a spring 63 serving to withdraw the arm 57 from its operative position and to hold it into contact with the cam 59.

As a means for guiding the incomirg blank' IIO the roller in engagement'with the cam.

I preferably employ a guide-plate 64,which is mounted upon the shaft 65, to which a rocking movement is imparted from the lever 66 and roll 67 from the cam 68, mounted upon the shaft a spring 69 serving to keip n this way the guide-plate 64 serves to compressthe front end of the blank and guide it safely into proper position between the blank-folding plate 40 and the blank-support, after which the guide-plate 64 is lifted,

latory blank-support is shown in place of the. rotary support previously described.

The blank-support 100 is directly connected to the arms48 by bolts, so that as the arms 48 are oscillated by. their operating-sectors 49 the support will be carried back and forth by the arms, the .operationof-the carrier-slides 52: in the arms 48 being as hereinbefore described. a

The mode of operation of" my improved a machine is as follows: Bellows-sided tubing is drawn into the machine by the feed-rolls 13 and 14 and guided by the guide-plate 64 between the blank-folding 1nember40 and the blank-su port 23, as shown in Fig. 3, so that the tuc '-holders 27 and the front dia- 'mond-holder 32 will engage the lower ply of 40 the blank. Atthe same time the.boX-hold ers 42 swing into the side tucks and grip the outer edges of the upper ply of theblank against the under side of the folding-plate 40.

During this time the blank-support and the folding means travel forward in the direction of the arrow a in register with the blank.

As this forward movement continues the folding-plate 40 is carried forward to the position shown in Fig. 5, at which position the folding-plate 40 is away from the blank-support far enough to stretchout the tucked sides of the tube between them, thus defining at least approximately the outer margins of the inner triangular folds, this separation of the plate 40 from the blanlesu port being effected by the cams 55. By this arraime ment it will be observed that the turning-back means, comprising the member 40 and the box-holders 42, are rotated about a center of rotation lying a substantial distance from the surface of the folding-bed, so that the front end of the-upper ply is turned back about the line in tl e upper ply as an axis, which is called the primary transverse crease-line of the diamond, while said line lies at a substantial distance above the lower ply. The engaging means formed by'the boxholders and the cooperating portionsof the member 40 thus serve to carry the portion of the upper ply gripped by them through a path concave toward the folding-bed such practically defined by the box-holders 42 and the tuck-holders 27, hile those portions of the box which are above those corners are in substantially free condition, after which.

the continued swinging movement of the plate 40, in connection with its falling movement toward thesurface of the blank-support, serve to draw the side edgesof the boxlike form toward each other into the well known flattened diamond form shown in Figs. 7 and 8. At the positionshown in Fig. 7 the diamond is still further flattened by means of the drop-plate 71. The arms 57 are thrown inwardly by the cams 59 to release the boX-hol'ders from the blank, and'the latter is drawnforward under the clrop plate 51, which then moves more closely to the blank-carrier, thereby flattening the diamond more completely. The blank .then

passes under the roll. 79, after which the front 1 older and the tuck-holders release the blank, which-is then delivered to the flap-folding devices, which maybe carried by the rollers indicated by dot-and-dash lines 81 and 82. It will be observed that the blank-folding member 4r0, which isguided at one end by the swivel-guide 47, pivoted to the stationary framework of the machine, is supported at IIO the other end by a pair of trunnions 41, at-

tached to brackets secured to the .plate 40. These trunnions are pivotally supported on the ends of the slides 52, sliding in the arms 48; These slid cs constitute-supporting means to which the blank-folding member 40 is pivoted, which means are movable transversely of and also with the blank-carrier by the cams acting on the slides 52 and-the sectorgea'ring for turning the arms 48 about their fixed hubs;

I claim as my invention-- 1. In a bag-machine, mechanism for forming diamond folds on bellowssided blanks,

having in combination a rotaryfolding-bed,

carriers oscillating about a center situated within the rotary ath of the bed, turningback mi ans moved by said carriers through an oscillatory path abt ve the rotary path of ing diamond folds on bellows-sided blanks,

the bed and means foroperating said turning back means on said carriers to engage and turn back the upper ply of a blank as the blank travels with the bed.

2. In a bag-machine, mechanism for forming diamond folds on bell o ws-sided blanks, having in combina ion a rotary folding-bed, a carrier oscillating about a center situated within the rotary path of the, bed, turningback means engaged by said carrier and moved through an oscillatory path above the rotary path of the bed, and means for oper: ating said turning-back means to engage and turn back the upper ply of a blank as the blank travels with the bed.

3. In a bag-machine, mechanism for formhaving in combination a rotary folding-bed, oscillating arms pivoted within the rotary path'of the bed, turning-back means moved by said arms throu h an oscillatory path above the rotary path of the bed and means for operating said turningaback means on the arms to engage and turn back the up er ply of a blank as the blank travels with the bed.

4. In a bag-machine, mechanism for form- .ing diamond folds on bellows-sided blanks,

having in combination a shaft, a rotary fold in bed supported thereby, arms one at each si e of the folding-bed each journaled around said shaft, means for continuously rotatin said folding-bed, means for oscillating said arms about the shaft, means for causing a I blank to advance with the bed, and means carried by the arms for engaging and turning back the upper ply of said blank.

5. In a bag-machine, mechanism. for form- 'ing diamond folds on bellows-sided blanks including in combination, a continuously-rotating' shaft, a rotary foldin -bed secured thereto, an arm at each end 0 the bed having a portion surrounding the shaft, a second V of a blank advanced by the folding-bedl 6. In a bag-machine, mechanism for forming diamond folds on bellows-sidedblanks, including in combination, a rotating shaft, av

blank-support mounted on said shaft and turning with it, said support having a series of folding-beds arranged atintervals about the shaft, an arm at each end of the support having a portion surrounding the shaft,

means carried by the arms for engagin and turning back the upper ply of a ba -blank and ,means for turning t 1e arms about the shaft with the support while said turning means operate upon a blank carried ,by one or 821d beds and then turning-the arms in the opposite direction 'to bring the turning means carried by them into operative relation with the blank carried by a succeeding bed.

. 7. In a bag-machine, means for forming anism on said arms, to engage and open the blank during its movement with the bed.

8. In a bag-machine, mechanism for forming diamond folds on bellows-folded blanks, having in combination a rotary folding-bed, oscillating arms pivoted within the rotary path of the bed, folding mechanism pivotally supported on said arms and means for oscillating said folding mechanism relative to said Hvl'lIlS.

9. In a bag-machine, mechanism for forming diamond folds on bellows-folded blanks, having in combination a rotary folding-bed, oscillating carrier-arms moving on a center of oscillation situated within'the rotary path of the bed, devices mounted for oscillation upon the said arms, and means for operating said devices on the arms to engage and 0 en the blank during their movement with t e bed,

10. In a bag -,;nachine, mechanism for forming \diamond' folds on bellows-folded blanks, having in combination a rotary foldingbed, oscillating carrier-arms moving on a center of oscillation situated within the rotary patlf of the bed, devices mounted for oscillation on the said carriers, said devices including imeans for engagingthe upper ply of the blank, means for swinging the carrierarms forward in the direction of travel of the blank, and means for turning the said devices backwardly to fold the diamond as the carrier-arms are thus moved forward.

11. "In a bag-machine, mechanism for forming diamond folds on bellows-folded blanks, haying in combination a rotary folding-bed, oscillating carrier-arms su ported for oscillation upon-an aXis situate within the rotary,path of the bed, holders cooperating with the said bed, to hold the lower ply of the blank thereon, and folding devices mounted for oscillation upon the said carrier-arms, including holders for engaging the upper ply of the blank, means for moving the carrierarms forward in the direction of travel of the folding-bed, and means for turning the said folding devices backwardly to form the diamond.

1-2. In a bag-machine, mechanism for forming diamond folds on bellows-folded blanks, having in combination arotary folding-bed, oscillating arms moved about a center of oscillation located within the rotary path of the'bed, folding mechanism moved by said arms through an oscillatin I path above the rotary path of the bed, an yielding side grippers having a capacity for lateral movement; to engage and disengage the 13. In a bag-machine, mechanism for forming diamond folds on bellows-sided blanks including in combination, a rotary folding-bed, a carrier mounted for oscillation about a center situated Within the rotary path of the bed, a member pivoted to said carrier and having a fold-defining edge,

vmeansfor holding the upper ply of the blankagainst said edge, means for oscillating said carrier andmeans foroscillating said member relative to said carrier.

I 14. In a bag-maclune, mechanism for forming diamond folds on bellows sided blanks, including a folding-bed, tu'rning back mechanism including a transverse-folddefining member mounted for oscillation upon an axial support, said axial support,

-means for causing a continuous advancement of the folding-bed, and means for reciprocating the said axial support back and forth lengthwise of the path oftravel of the bed.

15. In a bag-machine, mechanism for forming diamond folds on bellows sided blanks, including a folding'-bed,- a transverse fold-defining member mounted for oscillation upon an axial support substantially in alinement 'With the fold-defining portion of said member, said axial support, means for l1o1ding-the upper plyof the blank against said edge, means for causing a continuous advancement of the folding-bed, and means for reciprocating the said axial sup ort back and fort lengthwise of the path 0' travel of the bed.

16. In a bag-machine, mechanism for,

forming diamond-folded blanks from bellows-sided tubes, having in combinationa rotatin foldin bed provided with means for holding the ower bellows folds of a tube, oscillating arms pivoted within the path of the rotating bed, means carried by the oscillating arms, for defining the cross-fold of the diamond, holders also carried by the said arms for engaging the upper bellows folds of a-tube, means for oscillating said holders and fold defining means on an axis carried by said arms, and means for moving said axisand the parts supported thereby toward and away from the folding-bed.

17. In a bag-machine, mechanism for forming diamond folds on bellows-sided bagblanks, "including a movable blank-support having a folding-bed upon which the diamondis flattened, means'for securing the lower ply of the bag-blank thereto, turning back mechanism including a member having a cross-fold-defining edge, and means for moving said member so that said edge travbl ank-support havin tuck-holders, of a blanIr-folding member havrotary pivotal els, during the diamond-folding operation, at

substantially the same speed as-that of the surface of the blank-support and through a predetermined path which is substantially similar to the path traveled by the portion of the blank secured to said support, said paths member having a cross-fold-defining edge,

means for moving.said member so that said edge travels, during the diamond-folding operation, at substantially the same speed as that of the surface of the blank-support, and through a predetermined path which is substan tially parallel to the path traveled by the portion of the .blank secured to said support, said paths being separated by a substantial distance during the time of defining the outer margins of the inner triangular folds, and for turning said member relative to said edge at an axis while the edge is traveling along said predetermined path. 119. The combination, with a traveling a folding-bed and ing a defining edge and box-holders, and mounted for oscillation on a movable axis which 1s substantially in ahnement With said defining edge, means for; swinging said member upon said axis during the diamond-fold ing operatipn, and means for moving the said defining edge and axis toward and away from a position, which at the time of defining the outer marginsof the inside triangular folds is at a substantial distance from the blanksupporting surface of the blank-support.

-20. In a bag-machine, mechanism for forming diamond folds on bellows-sided blanks, having in combination a movable blank-support, turning-back mechanism including a movable blank-folding member having a defining edge and mounted for 0scillatio'n upon amo'vable axis, means for oscillating the blank-folding member upon its axis, and means for moving the said axis through different paths so that the defining edge is carried generally with the blank-support during the foldin operation, but at different distances there om during the formation of the inside trian ular folds.

21. In a bag-machine, mechanism for forming diamond folds on bellows-folded blanks, having. in combination a rotary folding-bed, oscillating arms ivoted'within the 1path of the bed, olding mechanism v supported on said arms to turn rela-' tively thereto about an axis above the rotary path of the bed, and means foroscillating said folding mechanism relative to said to move the engaging means relative to the I tive to said arms.

folding-bed through such a path concave toward the folding-bed, that the portion of the upper ply in which the crease-line is formed is lifted from the lower ply at the time of deifiriiing the margins of the inside triangular 23. The combination, witha movable blank-support having tuck-holders, of a movable blank-folding plate having a defining edge, box-holders, a guide mounted for oscillation 'around a fixed axis and provided with guiding-ways for the folding-plate, and means extraneous to the blank-support for moving the defining edge in apath which is a substantial distance away from thk surface of the support during the formation of the inside triangular folds.

24. The combination with a blank-support having tuck-holders, of a blank-folding plate having a defining-edge, box-holders, a movable plate-carrier supporting the plate subst antially in alinement with the defining edge,

means for moving said edge in a path which is away from the surface of the blank-support during the formation of the inner triangular folds, and means for 'guiding the outer end'of said plate.

25. In a bag-machine, mechanism for forming diamond folds on bellows sided blanks, having in combination a rotary folding-bed, oscillating arms pivoted within the rotary path of the bed, turning-back means moved by said arms through an oscillatory path above the rotary path of the bed,means for moving said turning-back means toward and away from the bed, and means for operating said turning-back means on said arms to engage and turn back the upper ply of a blank as'the blank moves with the bed.

26. In a bag machine, mechanism for forming diamond folds on bellows-folded blanks, having in combination a rotary folding-bed, oscillating arms pivoted within the rotary path of the bed, pivotal supports for folding mechanism carried on said arms, means for reciprocating said pivotal supports so that they approach and rocede from the path of the bed, folding mechanism connected to said pivotal supports so as to oscillate thereon in formin the diamond, and means for oscillating said folding mechanism rela- 27 In a bag-machine, mechanism for forming diamond folds on bellows-folded blanks, having in combination a rotary folding-bed, oscillating arms pivoted within the path of the rotary bed, trunnion-supports mounted on the oscillating arms and movable thereon toward and away from their center of oscillation, trunnions mounted on said supports, meanssecured to said trunnions for defining the cross-fold and turning back the upper pl'y of a blank, and means for oscillating the arms, reciprocating-the trunnion-supports, and oscillating the trunnions, whereby the cross-fold defining and turning-back means is operated in coaction with the bed.

28. In a bag-machine, mechanism for forming diamond folds on bellows-folded blanks, having in combination a rotary folding-bed, oscillating arms pivoted within the path of the rotary bed, slides carried by the nions mounted on said slides, means secured to said trunnions for defining the cross-fold and turning back the upper ply of a blank, and means for oscillating thearms, reciprocating the slides and oscillating the trunnions, whereby the cross-fold defining and turningback means is operated in coaction with the bed.

29. The combination with a blank-support having tuck-holders and unounted for continuous rotation, of a blank-folding plate having a defining edge, box-holders, acarricr on which the folding-plate is mounted for oscillation, and'means for reciprocating the said plate-carrier back and forth in the gen 7 eral direction of travel of the blank-support,

and also toward and from the surface of the support having tuck-holders, of a blank-folding plate having a defining edge, box-holders, arms mounted for oscillation 'upon an axis substantially in alinement with the axis of the blank-support, plate-carriers mounted on said arms for radial movement toward and from the said axis, and having the said blankfolding plate mounted for oscillation thereon. means independent of the blank-support for oscillating the said arms, and means for mov-' ing the said plate-carriers radially.

31. In a bag-machine, mechanism for forming diamond folds on bellows-sided blanks including in combination a foldingbed, blank-foldin mechanism including a transverse-foldde ining member mounted for oscillation upon an axis substantially in alinement with the fold-defining portion of said member, means for causinr a continuous adoscillating arms and movable thereon toward vancement of the foldinged, means for res '32. The combination with a movabletion, a blank-folding member and box-holders mounted for swinging movement .upon

the supports, said folding member having a defining edge, means for moving the supports to; carry said defining edge toward and from the surface of the blank-carrier, means for ad,- vancing the said supports in the direction of 2 5, travel of the blank-carrier during the blankfoldingoperation and means for oscillating the blank-folding member'and box-holders on said supports during the blank-folding opera tion.

34. The combination with a movable blank-carrier having tuck-holders, and with a blank-foldingmember having box-holders, of supporting means by which said member is pivotally supported, and movable transversely of, and also withthe blank-carrier throughout the diamond-folding operation.-

-35. In a bag machine, mechanism for forming diamond-folded blanks from bellowsfolded tubes, having in combination a rotat- 4 ing folding-bed provided with devices for holding the lower ply of the blank, oscillating arms pivotedwithin the rotary path of the bed, folding means carried by said arms, means for oscillating the arms, and means for imparting the necessary movements to the folding means carried by said arms.

36 In a bag-machine, mechanism for forming diamond-folded blanks from bellowsfold ed tubes, having in combination a rotating folding-bed provided with devices for holding the lower ply of the blank, oscillating arms pivoted ,within the path of' the rotating bed, folding means carried by said arms and moving therewith at times in the direction of.

movement of the bed and at times in the opposite direction, means for causing the folding means to move also toward and away from the path of the bed, and means for oscillating the said folding means-on an axis carried by the arms.

37. In a bag-m'achine, mechanism for forming diamond-folded blanks from bellowssided tubes, having in comb nation a rotating.

' folding-bed provided with means forholding the lower bellows-folds of the tube, oscillatsaopve ing arms pivoted within the path of the rotating bed, means carried by the oscillating arms for defining the cross-fold of the diamond, holders also carried by the said arms for engaging-the upper bellows-folds of a tube, means for oscillating said holders and folddefining means on an axis carried by said arms, and meansf-or moving said axis and the parts supported thereby toward and away from thefolding-bed. I

38. The combination, with a rotary blanksupport having tuck-holders, of a movable blank-folding plate having a defining edge,-

boX-hold ers, means for slidably guiding the outer end of said plate, and means extraneous to the blank-support for moving said defining edge in unison with the support during a portion of its folding movement.

' 39. The combination, with a rotaryblank- I support having tuck-holders, of a movable blanl -folding plate having a defining edge,

box-holders, means for supporting the said 'ing plate having a defining edge, box-holders,

a movable plate-carrier supporting the fiplate substantially in alinement .withthe de ning edge, a guide for the outer end of the plate, and means operable independently .of the blank-support for moving the said plate-carrier approximately in unison with theblanksupport during the formation of the inner triangular folds.

41. In a bag machine, mechanism for forming diamond folds on. bellows-sided blanks, including in combination a frame work, a rotating blank-support mounted in said framework a carrier oscillating about a center situated within the rotary path of the blank-support, means for engaging and turning back the upper ply of a blank as the blank travels with the support, said means being pivotally connected to said framework above said path and to said carrier.

42. In a bagmachine, mechanism for forming diamond folds on bellows-sided blanks including in combination a framework, a rotary blank-support mounted in said framework, a carrier oscillating about a center situat d within the rotary path of the blank-sup ort, means for engaging'and turning back t 1e upper ply of a blank as the blank travels with the support, said means being pivotally connected to ,said carrier, and means slidingly and pivotally connecting the engaging and turning-back means to, said framework.

43. In a bag-machine, mechanism for forming diamond folds on bellows-folded blanks, having in combination a rotary folding-bed having a front diamond-holder adapted to hold the lower ply of the blank at a osition elevatedabove the bed during the 1 gb mation of the diamond, oscillating arms pivoted within the rotary path of the bed, folding means moved by said arms through an oscillatory path above the rotary path of the bed, and means for operating said folding means to engage and open the blank during their movement with the bed.

44. The combination with a rotatable blank-support, of means for turning back the gaging and turning back the upper ply of said blank.

46. In a paper-bag machine, mechanism 'for forming diamond folds on bellows-sided bag-blanks, having in combination a folding bed, means for turning back the upper ply of the blank to form thediamond folss, and a holder for engaging the flap end of the bag blank to control its position relative to the' bed,- said holder havin its blank-engaging portion'at a snbstanti ll oistance above the surface of the blank-support during the folding operation.

WILLIAM AJLORENZ. W'itnesses:

LCHAS. .F. ScHMELz, JAS. DANenn'FiELnj 

